Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
nang dai » nang dau, nang tai, lang dai
cua quoc » cua nuoc, cua thuoc
tu sach » su sach, te sach, tu cach
dai hoi » dai hoc, dai hai, dai moi
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, vuc van
van anh » van thanh, tuan anh, van minh
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam
anh va » hanh va
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thu sach)) y nang dai hoi. hieu ve cam xuc van anh va cua quoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang dai hoi. hieu ve cam xuc van anh va cua quoc.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang dai hoi. hieu ve cam xuc van anh va cua quoc*.